| 摘要 |
PURPOSE:To simplify configuration and to reduce the cost of a device by using a phase shifting circuit with the cascade connection of primary and secondary phase shifting circuit as a main body. CONSTITUTION:The phase shifting circuit is provided with the cascade connection of the primary or secondary phase shifting circuits PS1-PSn, which number is correspondent to the asymmetrical degree of a loudspeaker, so that a phase shifting amount in a low frequency area can be larger than a phase shifting amount in a high frequency area with 1-2kHz as border. A level correcting means EQ is provided so that a level in the high frequency area can be decreased by delayed phase shifting and increased by advanced phase shifting corresponding to the increase of a frequency with 1-2kHz as the border. In such a way, the phase shifting amount is controlled by the primary or secondary phase shifting circuit. Thus, the configuration can be extremely simplified rather than executing a digital signal processing and by providing a frequency characteristic even to the level as well, right and left direction feelings can be increased. |
